Restaurant waiters or bartenders: 15%-20% (large groups may have gratuity already included, make sure to check your bill)
Taxi drivers: 15%-20% (most Uber & Lyft drivers do not expect a tip)
Spa services or hair dressers: 15%-20%
Coat check: $1
Bellhops or porters: 50 cents to $1 per bag
Hotel maids at upscale hotels: $1 per day of your stay
Tour guides and bus drivers: 20% or $10 per day (check whether this has already been figured into your cost)
Ushers at theatres do not expect tips